[patch 07/28] Add cmpxchg_local to arm

[Mathieu Desnoyers]

Use the new generic cmpxchg_local (disables interrupt). Also use the generic
cmpxchg as fallback if SMP is not set.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
CC: clameter@xxxxxxx
CC: rmk@xxxxxxxxxxxxxxxx
---
 include/asm-arm/system.h |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

Index: linux-2.6-lttng/include/asm-arm/system.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-arm/system.h	2007-10-31 17:32:44.000000000 -0400
+++ linux-2.6-lttng/include/asm-arm/system.h	2007-10-31 18:05:27.000000000 -0400
@@ -350,6 +350,21 @@ static inline unsigned long __xchg(unsig
 extern void disable_hlt(void);
 extern void enable_hlt(void);
 
+#include <asm-generic/cmpxchg-local.h>
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#define cmpxchg_local(ptr, o, n)				  	       \
+	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
+			(unsigned long)(n), sizeof(*(ptr))))
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+
+#ifndef CONFIG_SMP
+#include <asm-generic/cmpxchg.h>
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #define arch_align_stack(x) (x)

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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